Update release tag to use only chain-network input

Modified the GitHub Actions workflow to set the release tag name to only use the 'chain-network' input, removing the 'release-tag' input from the tag name.

.github/actions/upload-artifacts/action.yml

@@ -62,7 +62,7 @@ runs:
     - name: Make Release
       uses: softprops/action-gh-release@v2
       with:
-        tag_name: ${{ inputs.chain-network }}-${{ inputs.release-tag }}
+        tag_name: ${{ inputs.chain-network }}
         prerelease: contains(inputs.chain-network, 'testnet')
         files: ${{ inputs.asset-directory }}/lethean-*
         target_commitish: ${{ github.sha }}